Over the first four days the new online health insurance exchanges were open last week, more than 8 million people visited them, according to the Obama administration. At the very least, this casts doubt on the Republican claim that Americans hate Obamacare and want it repealed. It seems millions of people desperately want the coverage the law will allow them to get, regardless of their medical histories.

Alas, the administration managed to turn the experience for most of those visitors into a nightmare. Websites crashed, refused to load, or offered bizarre and incomprehensible choices. Even though the system was shut down for repairs over the weekend, Monday's early reports continued to suggest an epic screw-up.

President Obama's chief technology adviser, Todd Park, blames the unexpectedly large numbers of people who flocked to Healthcare.gov and state websites. "Take away the volume and it works," he told USA TODAY's Tim Mullaney.

That's like saying that except for the torrential rain, it's a really nice day. Was Park not listening to the administration's daily weather report predicting Obamacare's popularity?

Park said the administration expected 50,000 to 60,000 simultaneous users. It got 250,000. Compare that with the similarly rocky debut seven years ago of exchanges to obtain Medicare drug coverage. The Bush administration projected 20,000 simultaneous users and built capacity for 150,000.

That's the difference between competence and incompetence.

The too-much-demand excuse also is less than the full story. In addition to grossly underestimating demand, the administration and its contractors seem to have made mistakes in building the websites. The system for verifying consumer identity has had persistent problems, as have pull-down menus.

Nor were problems confined to the 36 state health exchanges run by the federal government. Sites run by 14 states and Washington, D.C., bogged down because they have to refer to federal databases to verify consumers' identity.

The non-federal exchanges appear to vary widely in performance. Maryland's highly touted site continued to generate a bewildering array of error messages on Monday, while a successful visit to the D.C. marketplace showed a profusion of plans at a wide range of prices — exactly what consumers have been led to expect.

Considering that officials had more than three years to prepare, it's hard even to imagine a credible excuse. And if the Medicare Part D experience is any guide, new layers of problems await as people finally get through and engage the complexities of buying insurance.

If there's good news, it's that technology can be fixed. Consumers have until mid-December to sign up for insurance that takes effect Jan. 1.

As the incompetence drones on, however, it hands ammunition to those who want to kill the law regardless of the broad interest in it. Delay — a tactic Republicans seek as a means of repealing Obamacare — is no answer.

Even so, the administration had better get its act together before frustration drives people away.

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